How to get rid of bend marks
It looks like you have to modify the vertices, you could try the smoot tool, select the veetices in the bend and smooth them, if that dows not work you could try using the sculpt mode and smoot a little with the smoothe brush.
If it does not work a would sujest using curves with a bevel object i is usually easier to achive curvy &quot;tubes&quot; with them.